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1、第2O卷第3期地學(xué)前緣(中國(guó)地質(zhì)大學(xué)(北京)；北京大學(xué))Vol_2ONO．32013年5月EarthScienceFrontiers(ChinaUniversityofGeosciences(Being)；PekingUniversity)May2013水熱法合成黃鐵礦微觀形貌和結(jié)構(gòu)的觀測(cè)與表征宋丹，劉佳，黃菲，李光祿，孟林，陳應(yīng)華，俞浩然，高尚，高文元東北大學(xué)，遼寧沈陽(yáng)110819SONGDan，LIUJia，HUANGFei，LIGuanglu，MENGLin，CHENYinghua，YUHaoran，GAOShang，G
2、AOWenyuanNortheasternUniversity，Shenyangli0819，ChinaSONGDan，LIUJia，HUANGFei，eta1．Observationandcharacterizationofmicromorphoiogyandmicrostruetureofpyritesynthesizedbyhydrothermalmethod．EarthScienceFrontiers，2013，20(3)：118—122Abstract：Bysimulatingthegeologicalconditi
3、onsofformingpyriteinhydrothermalgolddeposits，usingFeS()4andCH3CSNH2asrawmaterials，andkeepingtheratioofFe／Sat1：3，thepowdercrystalsofpyrite(FeS2)werepreparedbyheatingfor24hoursinacertaintemperaturebetween180—200℃．Themorphologyandcomponentsofthepyritecrystalssynthesize
4、dbydifferenthydrothermalconditionswereobservedbyscanningelectronmicroscopy．ThephasecompositionofexperimentalproductwasdeterminedbyXRD．Themorpholo～gyandmicro-structureofthepyritegrainsweresystematicallyobservedbyusingtransmissionelectronmicro—scope．Theresultsindicate
5、dthatat200℃，thepyritewasrelativelyuniformgranularwiththeparticlesizeabout1／am；atthetemperatureof180℃，besidesthegranularpyritewithsizeof1／amsynthesized，therewerealsoirregularbandingpyritecrystalswiththebandwidthof200nm．Withthegradualincreaseincrystal～lizationtemperat
6、ure，thecrystalmorphologychangedgraduallyfromirregularlyshapedcrystaltoregularshapecrysta1．Inhighexperimentaltemperature，therewouldbethegranularmorphology，whereasinlowtempera—ture，irregularribbonmorphologywouldappear．Keywords：hydrothermal；pyrite；morphologyandstructur
7、e；observationandcharacterizati0n摘要：模擬熱液型金礦床中黃鐵礦生成的地質(zhì)條件，采用硫酸亞鐵(FeSO)和硫代乙酰胺(CH。CSNH)為鐵源和硫源，在Fe／S比為l：3、溫度180～200℃、加熱時(shí)間24h條件下考察黃鐵礦的結(jié)晶情況。用SEM掃描電鏡觀察在不同水熱條件下合成黃鐵礦的形態(tài)及成分；用多晶X射線衍射儀(XRD)確定了產(chǎn)物物相組成；用透射電子顯微鏡(TEM)觀測(cè)表征了黃鐵礦晶體的形態(tài)和結(jié)構(gòu)。結(jié)果表明：在200℃時(shí)黃鐵礦為粒狀，粒度較均勻，粒徑l／am左右。在180℃時(shí)黃鐵礦除有尺寸在1／a
8、m左右粒狀黃鐵礦外，還有不規(guī)則帶狀黃鐵礦晶體，帶寬為200nin左右。認(rèn)為水熱條件中，隨著結(jié)晶溫度的逐步升高，黃鐵礦的形貌逐步由不規(guī)則形狀向規(guī)則形狀的轉(zhuǎn)變。所以在實(shí)驗(yàn)溫度較高階段，形成規(guī)則的粒狀形貌；在低溫階段，則會(huì)出現(xiàn)不規(guī)則帶狀形貌。關(guān)鍵詞：水熱法；黃鐵礦；形貌和結(jié)構(gòu)；觀測(cè)
